Assuming that the degree of hydrolysis is small, the pH of 0.1 M solution of sodium acetate (Ka = 1.0 x 10-5) will be :
5.0
6.0
8.0
9.0
0.1 0 0
0.1-x x x
Now, x << 0.1
Thus, pOH = 5 pH = 9
Hence, the correct answer is Option (4)